The ECOAIRF00030 5" Core Vent is a non-controllable wall vent designed to provide permanent airflow for combustion appliances. Finished in terracotta for a traditional appearance that complements brick and clay-toned exteriors, it is suitable for residential and light commercial applications where fixed ventilation is required. Manufactured for durability and dependable airflow performance, this vent is ideal for boilers, gas fires and other combustion appliances requiring passive ventilation in accordance with current building regulations. Suitable for both internal and external wall installations.